security forces of pakistan's largest city has been authorized to shoot on sight anyone who is believed to be involved in violence. five people have been killed since tuesday. the current unrest is blamed on armed gangs from rival political groups. friday was a day of mourning. the offices were closed. armed troops stand on guard on the streets of the business and commercial capital. three days of violence have been the worst karachi has seen this year. target killings and drive-by shootings are blamed on the gangs thanks to rival political parties. >> we're worried that the killings and violence have increased so much, no one is safe. this is the heart of the main shopping district. the streets here are normally bustling with shoppers. today, there are deserters. most people did not go to work. they are afraid of more violence. >> many of those shot dead in the recent killings were ordinary people going about their daily lives. some of them were killed. the most powerful political party represents iraqi's majority. the national party is supported by the working class. both are part of